[PATCH v2 04/12] powerpc/pseries/svm: Add a powerpc version of prot_guest_has()
From: Tom Lendacky <thomas.lendacky@amd.com>
Date: 2021-08-13 17:00:39
Also in:
amd-gfx, dri-devel, kexec, kvm, linux-efi, linux-fsdevel, linux-iommu, linux-s390, lkml, platform-driver-x86
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
Introduce a powerpc version of the prot_guest_has() function. This will be used to replace the powerpc mem_encrypt_active() implementation, so the implementation will initially only support the PATTR_MEM_ENCRYPT attribute. Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <redacted> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> --- arch/powerpc/include/asm/protected_guest.h | 30 ++++++++++++++++++++++ arch/powerpc/platforms/pseries/Kconfig | 1 + 2 files changed, 31 insertions(+) create mode 100644 arch/powerpc/include/asm/protected_guest.h
diff --git a/arch/powerpc/include/asm/protected_guest.h b/arch/powerpc/include/asm/protected_guest.h
new file mode 100644
index 000000000000..ce55c2c7e534
--- /dev/null
+++ b/arch/powerpc/include/asm/protected_guest.h@@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Protected Guest (and Host) Capability checks + * + * Copyright (C) 2021 Advanced Micro Devices, Inc. + * + * Author: Tom Lendacky <thomas.lendacky@amd.com> + */ + +#ifndef _POWERPC_PROTECTED_GUEST_H +#define _POWERPC_PROTECTED_GUEST_H + +#include <asm/svm.h> + +#ifndef __ASSEMBLY__ + +static inline bool prot_guest_has(unsigned int attr) +{ + switch (attr) { + case PATTR_MEM_ENCRYPT: + return is_secure_guest(); + + default: + return false; + } +} + +#endif /* __ASSEMBLY__ */ + +#endif /* _POWERPC_PROTECTED_GUEST_H */
diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
index 5e037df2a3a1..8ce5417d6feb 100644
--- a/arch/powerpc/platforms/pseries/Kconfig
+++ b/arch/powerpc/platforms/pseries/Kconfig@@ -159,6 +159,7 @@ config PPC_SVM select SWIOTLB select ARCH_HAS_MEM_ENCRYPT select ARCH_HAS_FORCE_DMA_UNENCRYPTED + select ARCH_HAS_PROTECTED_GUEST help There are certain POWER platforms which support secure guests using the Protected Execution Facility, with the help of an Ultravisor
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2.32.0